<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>{{ book.btitle }}</h1>
<ul>
    {% for hero in heros %}
    <li>
       {{ hero.hname }}---{{ hero.hcomment }}!!!!
    </li>
    {% endfor %}
</ul>
</body>
</html>